ClearRules clears all the rules in isolation module.

GetRules returns all the rules based on copy.

GetRulesOfResource returns specific resource's rules based on copy.

IsValidRule checks whether the given Rule is valid.

LoadRules loads the given isolation rules to the rule manager, while all previous rules will be replaced.

LoadRulesOfResource loads the given resource's isolation rules to the rule manager, while all previous resource's rules will be replaced.

Concurrency represents concurrency (in-flight requests).

Rule 描述隔离策略（例如信号量隔离）.

MetricType represents the target metric type.